How to Make a Gravity Puzzle (Brain Game)
ins_user2016-10-22T09:27:21+00:00How to Make a Gravity Puzzle (Brain Game)The challenge is simple .. just balance 14 nails on one nail head ... at the same time! In this project you'll learn how to make a fun little mind puzzle, for giving as a gift, or for entertaining...http://www.youtube.com/watch?v=sQrz6sRjiVI